Effects of Rare Earth La and Pulsed Magnetic Field on the As-Cast Microstructure and Mechanical Properties of ZL205A Aluminum Alloy AITranslate

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Chinese Library Classification Number:TG27[金属学及工艺]

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Based on the problems of unstable quality,grain coarsening and poor mechanical properties of aluminum alloy during the actual production of large-scale castings,in order to improve the applicability of aluminum alloy,the influences of rare earth La and pulsed magnetic field on as-cast microstructure and mechanical properties of ZL205A aluminum alloy were studied by means of optical microscope(OM),X-ray diffractometer(XRD),scanning electron microscope-enengy dispersive spectrometer(SEM-EDS),hardness tester and universal testing machine.The results show that after adding rare earth La to ZL205A aluminum alloy and applying a pulsed magnetic field,a new rare earth intermetallic compoundβ-LaAlCu is formed in the alloy.Moreover,the primaryα-Al dendrites and the skeletal structure of theθ(Al₂Cu)phase are refined,and their distribution becomes more uniform.As the time of applying the pulsed magnetic field increases,the grain size of the alloy becomes smaller.When 0.1%rare earth La is added and a pulsed magnetic field is applied for 90 s,the yield strength,tensile strength,elongation after breaking and hardness of ZL205A aluminum alloy are 138 MPa,214 MPa,9.5%and 74 HV,respectively.Compared with the original ZL205A aluminum alloy,they are increased by 22.1%,26.6%,6.0%and 13.8%,respectively.